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QR Challenge: Missing Numbers- Using the Inverse

Question	Answer
? + 75 = 90	15
23 + ? = 97	74
? – 54 = 38	92
? – 138 = 72	210
58 + ? = 146	88
6 x ? = 120	20
? x 9 = 72	8
98 ÷ ? = 14	7
240 ÷ ? = 30	8
8 x ? = 400	50
36 + ? = 59 + 19	42
42 - ? = 99-13	44
152 + 60 = 78 + ?	134
129 - ? = 150 – 84	63
172 - ? = 59 +19	94